Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c559a8786c39431…

MALICIOUS

PDF

46.3 KB Created: 2020-07-24 22:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc3462d22f252acd879e65650570294c SHA-1: d6e8c065ff5ff55fb776ff33124e09350c36bb45 SHA-256: 7c559a8786c39431ccc03ab28c09c9128bffe41fec180901ee4ff96833c05053
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits characteristics of a link farm, containing numerous external links, with one identified as a malicious redirector. The ML classifier strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to potentially harmful websites, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=alta+daily+snow+report
    • http://files.mysterytomb.com/uploads/1/3/1/4/131453028/2543991.pdf
    • http://files.azpeorialodge31.org/uploads/1/3/1/8/131857049/pilazixobu_kudonexizirad_kufezupoka_weximudagif.pdf
    • http://files.martelladesign.com/uploads/1/3/0/9/130968920/kilabopo-kejole-disexize.pdf
    • http://files.mlkswim.com/uploads/1/3/1/3/131383777/sosalebazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/2810601193.pdf
    • https://cdn.shopify.com/s/files/1/0432/0054/4931/files/6055268703.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/vizisag.pdf
    • https://cdn.shopify.com/s/files/1/0429/1746/2182/files/samum.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/gediregabovuseri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/mopevodabovasolonunara.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/92081679180.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/jigazixufimipomukad.pdf
    • https://cdn.shopify.com/s/files/1/0440/7905/5000/files/tafibemuregefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/40218902387.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007772.bin
57fea716b09121a5a6e553e0b87b45777fea37e40bcb355aa61d28eebaf2a31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7772 4924 bytes
font_01_sfnt_off00008851.bin
7f6155638cf1a196cf015395ad8922cb788975d55844fd62cd3c4b2a52462656
pdf-font-stream PDF embedded font (sfnt) at offset 0x8851 10428 bytes